A robotic lawnmower 1 is provided, having a deactivated state, a stand by state and an activated state. A removable disabling device 3 is arranged to be positioned in a first, a second, and a third position in a retainer 5 of the robotic lawnmower 1. The first position constitutes an off position in which the robotic lawnmower 1 is in a deactivated state. The second position constitutes a stand by position in which the robotic lawnmower 1 is in a stand by state. The third position constitutes an on position in which the robotic lawnmower 1 is in an activated state. The present invention also relates to a disabling device 3 arranged to be positioned in a retainer 5 of a robotic lawnmower 1 according to the invention.